For more than 15 years experts have known that ss7 could be abused to locate a phone user, intercept their text or voice data, or send texts or spyware to a device. Russia has exploited ss7 to track dissidents abroad. In the mid-1960s enterprising hackers realised that if they blew a particular toy whistle down the phone, they could trick the network into routing their call anywhere, free. When phone networks got wind of this, they changed how the system worked by splitting the channel carrying the voice signal from the one managing the call. How easy is it to hack a phone ?

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